23.5.A.0.575 firmware didn’t bring STAMINA Mode back which was removed in initial Marshmallow update but it was seen in latest beta update. All variants of Xperia Z2 have got this update.
Xperia Z2 23.5.A.0.575 firmware update
Check out the about phone screenshot below.
Xperia Z2 23.5.A.0.575 firmware ftf
For Xperia Z2 (D6503) – Pre-Rooted Flashable Zip
Flash the below mentioned zip file in recovery
Let us know if you have spotted any major changes in this update. Drop your comments below.
Source – XDA (Image Credits: dookiegbr)